<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        .bg{
            width: 300px;
            height: 300px;
            background-image: url("/src/img/kugou.png");
            background-size: cover;
            margin: 10px auto;
            position: relative;
        }

        .mask{
            width: 100%;
            height: 100%;
            background-color: rgba(0,0,0,0.5);
            position: absolute;
            top: 0;
            left: 0;
            z-index: 10;
            display: none;
        }

        .button{
            width: 80px;
            height: 80px;
            position: absolute;
            background-color: azure;
            z-index: 11;
            border-radius: 50%;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
            display: none;
        }

        .arrow{
            border: 25px solid transparent;
            border-left: 25px solid gray;
            width: 0;
            height: 0;
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-20%, -50%);
        }

        .bg:hover .mask{
            display: block;
        }

        .bg:hover .button{
            display: block;
        }

    </style>
</head>
<body>
    <div class="bg">
        <div class="mask"></div>
        <div class="button">
            <div class="arrow"></div>
        </div>
    </div>
</body>
</html>